Pipe-goupling



(No Model.)

F. G. ROCKWELL.

PIPE COUPLING.

No. 410,293. Patented Sept. 3, 1889..

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.iu fa 30 12) and. prevent their 'conta-ct'with the UNITED STATES PATENT Cirrics.

FREDERICK C. ROCKWELL, OF HARTFORD, CONNECTICUT PiPti-GGUPUNG.

sPEomIeA'r oN forming part of Letter To all whom it may concern:

Be it known that l, Fnnnnnicu' C, ROCK- WELL, of Hartford, Connecticut, have invented certain new and useful Improvements in Insulating Iipc-Couplin gs, of which the following is a specification.

My invention relates to the class of couplingsadapted to so jointho ends of two pipes that electricity cannot pass from one to the other.

The object of the invention is to provide a strong and 'heap coupling with the parts that are adaptec to be secured to the ends of the pipes completely insulated and held from each other by a solid mass of electrical nonconducting composition, in such manner that should the composition break up or crumble away the parts cannot uncouple.

.Reterring to the accompanying drawings, Figure 1 is a side view of the coupling joining two pipes. Fig. 2 is a central 'ver 'cal sectional view of the coupling. Fig. 3 is a similar View of a modifiedforni. i

The most perfect insulators are formed of compositions of earthy materialsand a binding substance supplied with-ahardening an; out solidified by heat and pressure. These compositions, however, are granular and brittle, and alone are 'insuflieie'ntly strong to bear the strain to which a pipecoupling supportiuga heavy chandelter is subjected without oracle ing and crumbling away. To utilize this class of effective and easily-molded compositions crumbling, also prevent the possibility of the falling .of a chandelier should the compositioircru nble' away, it construct the'couplingn with aii exterior shell a, preferably a metallic tube open at one end and partly closed at the other. Within this shell, through the open end, is placed a nut b, of less diameter than the sheila, but of greater. diameter than the opening a through the end of the shell, and around this nut insulating material is molded, so as .to prevent any part of the nut from coming in shell. -This insulating material which preferably consists of an electric non eonducting earth, as silica .or boi'ax, mixed with a bindingmaterial. usually a gum, as rubber, arid aha lening agcnhas sulie nut in a powdered liquid state and hardformin fits theform or molded in I ened, usually by heat and, pressure, a solid integ al mass which perfectly sition cannot be pu s Eatent No. 410,293, dated Eeptember 3, 1889.

Application filed February 11, 1 89- Soriel ll'o. 299,411. (No inodel.)

interior of the shell, preventing any contact between the nut and shell and rigidly holding the nut against rotation, so the threaded end of a pipe 7" may be screwed into it.-

The opening a through the end of the shell must be sufficiently large to prcventany contact between its edges and the walls of the pipe secured to the nut. A cap (I is secured to the open end of the shell to prevent the loosening or cracking of the insulating composition. This cap, which may eitherbe externally threaded and screwed into the shell or screwed 'onto the outside of the shell, as in Fig. 3, is provided with a thread for theattachment of a pipe f,- which usually is the end of a branch of the gas-piping' system of a building. The opening c made through the insulating composition for the passageof is preterably smaller than the opening through the nuts, so as to' prevent the pipes from dieing screwed iii so iarasio make contact with. each other. I

ltdesircd, there may be ashort'section "or pipe I) pcri'iu n eutly attached to the nut 11, the outer end of which is threaded to receive the end otthc chandelier-tube.

it will be seen that the nu t adapted to re ceiVe-one pipe cannot make contact with-thrshell of its cap; that the nutis rigidly held against rotation; that the insulating compollcd out of the shelLi'vithout crumbling; that if it should crack and crumble a chandelier hanging from one part would not drop, as the nut i) is too large to pass tli'rough the opening a, and that there is no chance for an accumulation of matter inside of the coupling, which would make a path for an electric currentfrom one pipe to another.

iclaim as my invention An insulating pipe-coupling consisting of an exteriorshell a, partly,closed at one end, containing an integral mass of insulating composition 0,,which surrounds on all fat-gs and ii'mly holds a parallel-sided nut l; of

greater dxiametcr than the smaller opening through he shell, and a threaded c: p (delim- 

